/**
 * cookie操作工具类 
 */
/**
 * 写
 */
function setCookie(name,value){
	var Days = 30;
	var exp = new Date();
	exp.setTime(exp.getTime() + Days*24*60*60*1000);
	document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}

function setoneCookie(name,value){
	document.cookie = name + "="+ escape(value);
}

/**
 * 读
 */
function getCookie(name){
	var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
	if(arr=document.cookie.match(reg))
	return unescape(arr[2]);
	else
	return null;
}
/**
 * 删
 */
function delCookie(name){
	var exp = new Date();
	exp.setTime(exp.getTime() - 1);
	var cval=getCookie(name);
	if(cval!=null)
	document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}